{"id":"CVE-2026-7507","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-7507","summary":"Keycloak: Session fixation in OIDC login flow that can lead to account takeover","details":"A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which processes session handles without adequate CSRF protection or cookie ownership validation—an attacker can reset the authentication flow state. This causes Single Sign-On (SSO) to authenticate the victim transparently upon clicking the link, allowing the attacker to hijack the required-action form without needing the victim's credentials. A successful exploit could lead to complete account takeover, including highly privileged administrative accounts.","published":"2026-05-19T12:31:42Z","modified":"2026-06-04T15:45:17.745151178Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.00568,"percentile":0.4434,"asOf":"2026-08-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","fixedVersion":"26.6.2"}],"fix":{"url":"https://github.com/keycloak/keycloak/pull/49134","label":"keycloak/keycloak#49134"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7507"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/pull/49134"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/commit/d791b270b9ea5203be40a9533c1c12c4d044fb52"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19594"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19595"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19596"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19597"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-7507"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2464145"},{"type":"PACKAGE","url":"https://github.com/keycloak/keycloak"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/releases/tag/26.6.2"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-06-04T15:45:17.745151178Z"}}